Chapter 8 Flashcards
Where does most of the water reside?and how much of it?
In the ocean, 97%
70% of world is ocean
What are the two major factors in the hydrologic cycle?
Evaporation and precipitation
What does the ocean dominate?
Evaporation and precipitation
How does the hydrologic cycle work on land?
First, it starts with precipitation, then evaporation + transpiration
How does the hydrologic cycle work over water?
First, evaporation then precipitation
Each year how much gain/loss of water does land get?
It gains 8%
Each year how much gain/loss of water does the ocean get?
It loses 8%
What does ET mean?
Actual evapotranspiration
How much does ET(land) input in the moisture balance of the atmosphere?
14%
How does evaporation occur?
Open water, soil, plant surfaces
**Soil
How does transpirartion occur?
Plants release water (evaporates)
Cooling
**Trees, Grass
What is Potential Evapotranspiration?
amount of water that evaporates/transpire under moisture conditions when there precipitaion and soil moisture
How is potential evapotranspiration determined?
Atmospheric Energy
* Latitude(solar angle,length of day)
* Temp.
POTET===
Demand
PRECIP ==
Supply
What is infiltration & percolation:?
Soil Moisture
(storage)
Gravitational H2O ?
Too much water
H2O is unavaliable for plants
Capillary H2O?
Just right
H2O avaible for water
Hygroscopic H2O?
No water
H2O unavilable for plants
*wilting point
what is a drought?
less precip. than EXPECTED or NEEDED
what does EXPECTED mean in a drought?
means to the climate climate
what does NEEDED mean in a drought?
demands exceeds supply
is a drought natural?
yes
a naturally recurring feature
what are they four types droughts?
Metorological
agricultural
hydrological
socioeconomic
*MATS (LIKE MATHS W/OUT THE T)